[Cynthia, Prescott, AZ]

I would say that if there are no living roots, as one could suspect with a plant looking like that, leaving it in the original mix and not disturbing serves no useful purpose. Think I'd take it out of the pot and inspect the roots. If there are living roots, put it into a mix of bark of mixed sizes, so that you can maintain moisture on the roots. I do not let Cyms dry out completely. I used to, and had terrible looking Cyms. I somehow got the idea to water much more freely, and wound up with huge Cymbidium bulbs like I use to see at the Santa Barbara Orchid Estates. If all roots are dead, it would be time for sphag & bag. S&B isn't usually used for Cyms because they usually have substantial bulbs to regrow from, but a seedling has little reserves.

It would probably be good to use a systemic fungicide from the looks of the plant. Have you used any horticultural oils on it like neem?

I have a couple of seedlings of erythrostylum, and I can't say I have done very well with them. They just don't seem to be making any progress. It may have been because of my bad experience with bad neem oil that held them up. My past research seems to indicate typical standard Cym treatment.